Valve



F. M. POWE June 9, 1942.

VALVE Filed Dec. 26, 1940 IN VEN TOR.

Emma

A TTORNEYS.

Patented June 9, 1942 i VALVE Frank Montgomery Powe, Mobile, Ala., assignor of one-fourth to Richard H. Coffin, Mobile,

Ala.

Application December 26, 1940, Serial No. 371,815

2 Claims.

The device forming the subject matter of this application is a stem for the valve of an internal combustion engine. The invention aims to provide a valve stem which will be long lived, requiring but little attention, an increased dissipation of heat being brought about without retarding the flow of gas mixture, and without impeding the valve stem in its movement.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds,

the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawing:

Fig. 1 shows in section, and partly in elevation, a device constructed in accordance with the invention;

Fig. 2 is a similar view at right angles to the showing of Fig. 1.

The numeral l marks part of the frame of an internal combustion engine, provided with a valve seat 2, the frame carrying a guide 3.

A valve operating means is shown, and may be of any desired sort. It may comprise a cam shaft 4, provided with a cam 5, cooperating with a tappet 6, the tappet operating a valve stem 1.

The valve stem 1 includes a reduced inner portion 8, an enlarged intermediate portion 9, having convexed ends l0 and II, and a reduced outer portion l2.

The reduced outer portion I2 of the valve stem 1 carries a valve l4, cooperating with the seat 2. The enlarged portion 9 of the valve stem 1 is slidably received in the guide 3.

The throw imparted to the valve stem I by the mechanism shown at 45 (or its equivalent) is such that the convexed ends ID and II of the valve stem, only, ever pass out of the guide 3. The cylindrical body portion 9 of the valve stem remains at all times within the guide 3.

The extent of the convexed portions [0 and l l of the valve stem may be varied to suit the demands of the various engines wherewith the device is employed. .The convexed portions l0 and II, have an advantage over square-cut shoulders, in that they avoid scuffing or gouging of the bore of the guide 3.

So far as I am advised a to the state of the art, structures approaching in general appearance the one herein disclosed, are intended primarily to remove carbon that may have accumulated on the exposed portions 8 and I2 of the valve stem. No such operation takes place in the device forming the subject matter of this application, because thereby the valve stem would be prevented from having the necessary freedom of reciprocation. As a matter of fact, the carbon accumulation on the parts 8 and I2 of the valve stem I seldom exceeds a film in thickness, and there is no occasion for scraping it off. As a matter of fact, whatever carbon may accumulate on the parts 8 and I2 of the valve stem 1, serves as an insulation, heat dissipation taking place by way of the intermediate portion 9 of the valve stem.

The intermediate part 9 of the valve stem 7 always moves within the confines of the guide 3, and owing to the presence of the convexed portions l0 and II, gouging or distortion of the bore of the guide 3 never take place in the device forming the subject matter of this application, whereas it does occur if square-cut shoulders replace the convexities shown at I0 and II.

The device forming the subject matter of this application is simple in construction, but will be found thoroughly advantageous for the ends in v1ew.

Having thus described the invention, what is claimed is:

l. Improvements in poppet valve structure for internal combustion engines, comprising a valve stem having reduced portions connected by a diametrically enlarged intermediate portion, the ends of the intermediate portion being convexed longitudinally and transversely of the stem, and a valve carried by one of the reduced portions.

2. Improvements in poppet valve structure for internal combustion engines, comprising a valve stem having reduced portions connected by a diametrically enlarged intermediate portion, the ends of the intermediate portion being convexed longitudinally and transversely of the stem, a valve carried by one of the reduced portions, a guide wherein the intermediate portion of the valve stem reciprocates, and actuating mechanism cooperating with the valve stem, the throw of the actuating mechanism being such that the convexed ends of the intermediate portion alone protrude alternately beyond the guide, so much of the intermediate portion as is between the convexed ends being housed at all times within the guide.

FRANK MONTGOMERY POWE. 

